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Post by mastertech on Aug 31, 2013 10:35:51 GMT -5
Well it looks like you don't have the +12v. Retest ic351.
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Post by Michael on Aug 31, 2013 11:15:16 GMT -5
Here is the results;
IC351= 151.4 mv
IC352= 11.96 v
IC353= 5.04 v
IC354= 4.95 v
IC355= 4.92 v
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Post by mastertech on Aug 31, 2013 11:21:55 GMT -5
LOL. No, I meant test the legs with your DMM on diode scale with it unplugged. Looking for a short between any legs.
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Post by Michael on Aug 31, 2013 11:31:54 GMT -5
IC351 is not shorted.
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Post by Michael on Aug 31, 2013 11:36:09 GMT -5
The only one behaving abnormally is IC355. |
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Post by Michael on Aug 31, 2013 11:38:55 GMT -5
I have to run out for a couple of hours today. Please give me a list of things to do so I can check when I get back. I don't know if you will be available tomorrow or on Monday. Please let me know when will you be back online so we can continue...
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Post by mastertech on Aug 31, 2013 11:43:08 GMT -5
On that regulator board you need to test R355 and R356. DMM on resistance scale you should get around 1 ohm each (almost short).
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Post by mastertech on Aug 31, 2013 11:44:06 GMT -5
We are almost to a point where you can order or pickup parts. Is there a parts store near you or do you have to order?
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Post by Michael on Aug 31, 2013 11:57:17 GMT -5
I am sure there is a part store in Atlanta that may have these parents.
Is there an online store you recommend to get these parts from? It might be a little cheaper! What do you think?
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Post by mastertech on Aug 31, 2013 12:26:26 GMT -5
I usually order from Mouser. Good prices and fast shipping. When we are ready to order I'll help you with it if you choose them.
We just have to find out what is bad for no +12v and then test Q301 that you removed from the fuse board to make sure it's ok and then we can put together an order.
So test those 2 resistors on the regulator board and then test Q301.
Here's how I want you to test Q301. I'm assuming it is still removed. With DMM on diode scale give me your readings to these tests.
Pins 1 and 2=
Pins 1 and 3=
Pins 2 and 3=
Then reverse probes:
Pins 1 and 2=
Pins 1 and 3=
Pins 2 and 3=
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Post by Michael on Aug 31, 2013 16:26:47 GMT -5
R355 = 0.9 Ohm
R356 = 0.7 Ohm
Q301, Still removed and tested. Results;
Pins 1 and 2= OL
Pins 1 and 3= OL
Pins 2 and 3= OL
Reverse probes:
Pins 1 and 2= OL
Pins 1 and 3= 0.655
Pins 2 and 3= 0.650
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Post by mastertech on Aug 31, 2013 16:37:44 GMT -5
Q301 is good. That is just how it should test.
But R355 looks good so still not why no +12v. So you are going to have to do another voltage test with it plugged in. DMM on DC voltage, Negative probe attached to chassis for ground. Plug it in and test both sides of R355. Should get around +17v.
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Post by Michael on Aug 31, 2013 16:52:14 GMT -5
R355 = - 0.488 on both ends!!
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Post by mastertech on Aug 31, 2013 16:56:51 GMT -5
How about R356?
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Post by Michael on Aug 31, 2013 17:02:28 GMT -5
R356 = - 19.79 and - 19.84 on the other end.
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